p392-393:Layout 1 15/5/07 13:02 Page 1
i Technical Information
Isolation shall be provided as near as possible to the origin of the installation, by a
Switchgear & Distribution linked switch or circuit breaker capable of interrupting the supply on load.
This means that there should not be any other equipment upon which work may be
Proteus
required to be carried out, between the origin and the means of isolation provided.
The PROTEUS range of Pro 2000 cubicle switchboards, is one of the most advanced
The means of isolation should comply with all of the relevant Regulations for
modular systems in the market place today.
isolation.
It has been designed to meet virtually all market requirements, and in particular for
A main switch or circuit breaker at the origin of the installation shall switch the
those customers who require higher levels of protection.
following conductors of the incoming supply:
The range is based on a modular dimension of 125mm. This small dimension gives
both live conductors when the supply is single-phase a.c.,
a higher degree of flexibility in designing a board to a specific requirement,
all poles of a d.c. supply,
particularly when space is limited. Using this modular design means modifications,
all phase conductors in a T.P., or T.P. & N., TN-S or TN-C-S system supply,
additions or extensions are simplicity itself.
all live conductors in a T.P. or T.P. & N., TT or IT system supply.
Any combination of fuse switchgear, MCCB’s , MCB’s and air circuit breakers are
available. Incoming and outgoing cables can be top or bottom entry/exit and access
One switching device is allowed to isolate a group of circuits.
can be front or rear. Any other special requirements please contact factory. 460-01-02, 461-01-01,
461-01-02, 461-01-02
Where the supplier of electricity provides switchgear complying with the regulations
at the origin of the installation, and agrees that it can be used to isolate the
installation from the origin up to the main distribution at which isolation is provided,
this agreement satisfies the requirements of the regulations for having a main switch
at the origin.
476-01-01
All isolators shall be durably marked to identify the circuits or installation they are
controlling.
Where circuit breakers can be operated by unskilled persons, it should not be
461-01-07
possible for the setting or calibration of the circuit breaker’s overcurrent release to
be modified without the use of a key or tool resulting in a visable indication of the
A means of interrupting the supply on load shall be provided for every circuit and
setting or calibration.
final circuit.
476-01-02
Co-ordination is required between overload devices and fault current protective
devices, such that the energy let through the fault current protective device is within Where an isolator is used in conjunction with a circuit breaker to enable maintenance
the withstand capacity of the overload device. of switchgear to be carried out, it shall be interlocked with the circuit breaker, or be
so placed and guarded that it can only be operated by skilled persons.
435-01-01
476-02-01
Where a common device is used for both overload and fault current protection, it
shall be capable of breaking (and for circuit breakers making) any overload or fault
Distribution boards
current at the point the device is installed.
When fuses are likely to be removed or replaced whilst the circuit they protect is
432-02-01
energised, they shall be of a type that can be removed or replaced without danger.
Protection against direct contact can be achieved by barriers or enclosures; these
A short-circuit current or an earth fault current shall be interrupted by a protective
shall be secured firmly in place, and must maintain the required degree of protection
device before such a current can cause damage or danger, due to thermal or
during normal service. Live parts shall be in an enclosure, any opening in which
mechanical stresses in the conductors or connections.
must not give access to objects larger than 12mm diameter, and up to 80mm long
(IP2X). Where the opening is in a top surface of the enclosure, the opening must not
The nominal current rating of a protective device used for protection against fault
exceed 1mm in diameter (IP4X).
currents may be greater than the current-carrying capacity of the circuit conductor
412-03-01, 412-03-02, 412-03-03
the device is protecting.
533-01-03
434-01-01
Every overcurrent protective device shall have the nominal current rating of the
Where a protective device is used for both overload and fault current protection, and
circuit it protects either marked on it, or placed adjacent to it.
has a breaking capacity at least equal to the prospective fault current at the point it
533-01-01
is installed, and the circuit conductors have been sized in accordance with the
regulations for overloads. It can be assumed that the conductors installed on the
The current rating to be indicated for semi-enclosed (rewirable) fuses shall be in
load side of the protective device are protected against fault current.
accordance with the table given in 533-01-04.
This assumption must be checked where conductors are placed in parallel or the
protective device is a non-current-limiting type of circuit breaker. Checking that the
533-01-01
conductors are protected can be done by using the formula of Regulation
434-03-03.
Residual current device
Residual current devices only give protection against leakage currents and do not
434-03-02
protect circuits from overload or short-circuit currents, unless the rcd specifically
designed to contain such devices.
Switches and isolators
An RCD cannot be used as the only means of protection against direct contact, but
Isolators are not designed to make or break load current, but only to isolate the
it can be used to reduce the risk of direct contact, providing:
circuit after the current flow has been switched off.
it has a residual operating current not greater than 30mA, and has a residual
A switch is a mechanical device capable of carrying, making and breaking current
operating time not exceeding 40msec, when subjected to a residual current of
under normal circuit conditions. It may also be capable of making but not breaking
150mA,
fault currents.
protection against direct contact is provided by insulation, barriers, enclosures,
Touch switches, or electronic switches are therefore not switches as far as the
obstacles, or placing out of reach.
Wiring regulations are concerned.
412-06-02
Please Note: All prices shown exclude V.A.T.
392
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